Head Sommelier Michael Madrigale announces via email and on his Instagram @mikemadrigale which big bottle (magnum, double magnum, or bigger) he will be offering by the glass each night. Glass pours are generally $29 or less, and the value for the dollar is usually strong, with many super prestigious bottles having been opened over the years. Every night is a different selection, and glasses are offered until sold out. [Photo: Facebook]

A large format bottle (magnum or larger) is opened and poured by the glass starting at 9 p.m. each evening. A different selection is poured each night, and announced via Instagram @sohmbar. Prices vary with the wine, but Sommelier Aldo Sohm tries to keep the tariff low. There is also a $14 summer rosé flight of three wines currently available, poured from 750ml bottles. [Photo: Paul Crispin Quitoriano]

A large format 3L bottle of Italian wine is opened every day at 3 p.m. and poured by the glass for pricing around $18 a glass. [Photo: Facebook]

Sommelier Jack Mason selects a different prestigious Champagne to pour from magnum each Monday through Friday from 5 p.m. to 7 p.m. The price is kept low; generally $15 to 17 per glass.[Photo: Krieger]

A Champagne is selected each week and announced by email and on Instagram @champagnemademedoit. The pricing is light for the quality offered, generally $13-15 per glass, and 30 glasses are available until the offer runs out for the week. The special price is applicable from 5:30pm to close each night at Piora. [Photo: Krieger]

Bottles of wine are 20 percent off each Sunday at Fung Tu. [Photo: Krieger]

Selected bottles of wine are half off all night long on Sundays and Mondays, and every Tuesday through Saturday from 5 to 7 p.m. There are also $8 glasses of wine and $5 glasses of sherry every night from 5 to 7 p.m. [Photo:

Select bottles of wine are 50 percent off every Sunday at Asellina. [Photo:

A number of different wines are available by the glass for just $8 from 4pm to 6pm. Glasses of Sherry and Madeira are also discounted before 6 p.m. [Photo: Krieger]

The Gotham Project wines on tap are half off for glasses during Oyster Happy Hour, from 5 to 7 p.m. weekdays and 12 to 3 p.m. on weekends. Sparkling Riesling glasses are $6 instead of the normal $12, Manzanilla Sherry glasses are $5 instead of $10. [Photo: Krieger]

From 9 p.m. to close on Monday nights, all bottles of Lambrusco are $28 at Osteria Morini, and glasses of Lambrusco are $7. [Photo: Krieger]

Tasca Chino offers 2014 Ameztoi Txakolina poured from the glass porrón pitchers traditional to many regions of Spain. Drinking 3/4 of a liter of Ameztoi from the porrón spout costs $39, which is less than the normal cost for a bottle of the 2014. [Photo: Facebook]

Every other Saturday features a drop in wine tasting opportunity at Del Posto. Guests get to try 5 different wine tastes, grouped by a different theme for each tasting, for only $5 in cash. The tasting starts at 1 p.m., and is led by a member of the Del Posto sommelier team. No reservations are required to attend. The next tasting is scheduled for August 15th. [Photo: Del Posto]